虚假的幸福使人变得刻薄和傲慢，而这种幸福从不传播。真正的幸福使他们善良和明智，而这种幸福总是分享的。
不要小看孩子，他们比我们想象的要聪明得多。
在这个世界上，我该爱的人是我自己。
The power of causal reasoning is that it allows us to predict the effects of actions we have never taken.
We not only want to succeed in China, but also globally.
The only way to learn mathematics is to do mathematics.